[clug] Who has better dd foo than I?

Paul Wayper paulway at mabula.net
Tue Aug 7 04:16:41 MDT 2012

Hash: SHA1

On 07/08/12 18:16, Michael Still wrote:
> On 07/08/12 17:33, Paul Wayper wrote:
>> On 07/08/12 12:26, Ben Coughlan wrote:
>>> Not sure about your actual question, but an alternative solution
>>> would be to use LVM.  You can create a small volume and gradually
>>> increase it when you need to.  Modern kernels can do the
>>> filesystem resize online.  You could even do it without LVM by
>>> just resizing the partition on the disk, but that doesn't feel as
>>> safe.
>> I totally support this way of doing things.
>> lvextend -L +10G /dev/volumegroup/logicalvolume # gives it an extra
>> 10GB resize2fs /dev/volumegroup/logicalvolume # extends ext3 to
>> fit.
> Doesn't resize2fs require a fsck to have been run though? And that
> can't be done online.

You do have to on some older kernels when shrinking the file system - from
memory, I've had to offline the LV to shrink it on RHEL 4 but not RHEL 5.  But
expanding it is, AFAIK, simply a matter of updating the super block and adding
some metadata in ext3 - in extent-based ext4 and xfs it's much faster (and
still online).

Hope this helps,

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